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Q: abs causing engine surge on 1994 Acura Integra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i drive a 94 gsr, the abs light had been coming on and going off for awhile, no it stays on, when i pump my brakes it causes my engine which is already reving high to surge, pump a few times and it shoots up to 2500rpm then down to around 800, then settles around 1600rpm where it idles, the car has many upgrades but always idled around 900, any suggestions?
Thank You
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Not really an answer, just some suggestions...
Did you check for any vacuum leaks, or that it holds vacuum after the engine is shut off? Have you tried removing the fuse for the ABS pump and pumping the brake pedal to see if it does the same thing? Any ABS faults when you look for codes?
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